First cut trivial re-materialization support.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35208 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.h b/lib/CodeGen/VirtRegMap.h
index 5b06c01..61ce92f 100644
--- a/lib/CodeGen/VirtRegMap.h
+++ b/lib/CodeGen/VirtRegMap.h
@@ -18,6 +18,7 @@
#define LLVM_CODEGEN_VIRTREGMAP_H
#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/IndexedMap.h"
#include "llvm/Support/Streams.h"
#include <map>
@@ -28,6 +29,12 @@
class VirtRegMap {
public:
+ enum {
+ NO_PHYS_REG = 0,
+ NO_STACK_SLOT = ~0 >> 1,
+ MAX_STACK_SLOT = (1 << 18)-1
+ };
+
enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
typedef std::multimap<MachineInstr*,
std::pair<unsigned, ModRef> > MI2VirtMapTy;
@@ -53,14 +60,20 @@
/// read/written by this instruction.
MI2VirtMapTy MI2VirtMap;
+ /// ReMatMap - This is irtual register to re-materialized instruction
+ /// mapping. Each virtual register whose definition is going to be
+ /// re-materialized has an entry in it.
+ std::map<unsigned, const MachineInstr*> ReMatMap;
+
+ /// ReMatId - Instead of assigning a stack slot to a to be rematerialized
+ /// virtaul register, an unique id is being assinged. This keeps track of
+ /// the highest id used so far. Note, this starts at (1<<18) to avoid
+ /// conflicts with stack slot numbers.
+ int ReMatId;
+
VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
- enum {
- NO_PHYS_REG = 0,
- NO_STACK_SLOT = ~0 >> 1
- };
-
public:
VirtRegMap(MachineFunction &mf);
@@ -125,6 +138,29 @@
/// the specified stack slot
void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
+ /// @brief assign an unique re-materialization id to the specified
+ /// virtual register.
+ int assignVirtReMatId(unsigned virtReg);
+
+ /// @brief returns true if the specified virtual register is being
+ /// re-materialized.
+ bool isReMaterialized(unsigned virtReg) const {
+ return ReMatMap.count(virtReg) != 0;
+ }
+
+ /// @brief returns the original machine instruction being re-issued
+ /// to re-materialize the specified virtual register.
+ const MachineInstr *getReMaterializedMI(unsigned virtReg) {
+ return ReMatMap[virtReg];
+ }
+
+ /// @brief records the specified virtual register will be
+ /// re-materialized and the original instruction which will be re-issed
+ /// for this purpose.
+ void setVirtIsReMaterialized(unsigned virtReg, MachineInstr *def) {
+ ReMatMap[virtReg] = def;
+ }
+
/// @brief Updates information about the specified virtual register's value
/// folded into newMI machine instruction. The OpNum argument indicates the
/// operand number of OldMI that is folded.